Abstract
1. In the present study we compared neuropeptide Y (NPY) and NPY-related analogues for their ability to activate or bind to vascular NPY receptors in four experimental set-ups. Previous results have suggested the existence of different receptor subtypes, Y1 receptors requiring full-length NPY (1-36) or [Pro34]-NPY, and Y2 receptors recognizing also N-terminally truncated forms of NPY but not [Pro34]-NPY. 2. NPY 1-36 and [Pro34]-NPY dose-dependently increased arterial pressure in the anaesthetized rat with a similar magnitude and potency. NPY 2-36 was much less potent than NPY 1-36. NPY 4-36 and NPY 11-36 were inactive even at a dose as high as 10 nmol kg-1. 3. NPY 1-36, [Pro34]-NPY, NPY 2-36 and NPY 5-36 concentration-dependently increased the coronary resistance in the Langendorff preparation of the rat. NPY 1-36 and [Pro34]-NPY were equipotent, while NPY 2-36 and NPY 5-36 were about 7 and 20 times less potent. At 0.3 microM, NPY 11-36, NPY 20-36 and NPY 22-36 induced a slight contraction while NPY 23-36 was inactive. 4. NPY 1-36, [Pro34]-NPY, NPY 2-36, NPY 4-36, NPY 5-36 and NPY 11-36 evoked concentration-dependent contractions in the isolated inferior caval vein of the rat and guinea-pig. [Pro34]-NPY was more potent than NPY 1-36. NPY 2-36 was equipotent with NPY 1-36, while NPY 4-36, NPY 5-36 and NPY 11-36 were approximately 30 times less potent.(ABSTRACT TRUNCATED AT 250 WORDS)
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